package com.qing.administer.result;

import com.qing.administer.annotations.ResponseResult;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

//请求拦截器
@Slf4j
@Component
public class ResponseResultInterceptor implements HandlerInterceptor {




//    代码核心思想，就是获取此请求，是否需要返回值包装，设置一个属性标记。
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        log.info("-------------进入拦截器打标记------");
        if(handler instanceof HandlerMethod){
            final HandlerMethod handlerMethod= (HandlerMethod) handler;
            final Class<?> clazz=handlerMethod.getBeanType();
            final Method method=handlerMethod.getMethod();
            //判断是否在类对象上加了注释
            if(clazz.isAnnotationPresent(ResponseResult.class)){
                //设置此请求返回体，需要包装，往下传递，在ResponseBodyAdvice接口进行判断
                request.setAttribute(CommonFinal.RESPONSE_RESULT_ANN,clazz.getAnnotation(ResponseResult.class));
            }
            //判断方法上是否有注释
            else if(method.isAnnotationPresent(ResponseResult.class)){
                //设置此请求返回体，需要包装，往下传递，在ResponseBodyAdvice接口进行判断
                request.setAttribute(CommonFinal.RESPONSE_RESULT_ANN,method.getAnnotation(ResponseResult.class));
            }

        }
        return true;
    }

}
